HVAC & Refrigeration Questions + Answers

HVAC & Refrigeration Questions + Answers

Ice machine compressor efficiency

Oil safety control trip

Question: When a compressor has unloaders, why is the oil viscosity important, especially in regard to internal vs. external unloading?

3 ways to adjust hot-gas bypass valves

Many factors affect megohm readings

Silver solder, freezers, drop-ins and hose leaks are questioned

HFC-134a and moisture

High discharge temperature

Question: Will you please explain the service factor rating and tell how to determine service factor amperes if it's not shown on the motor nameplate?

Motor identification

Heat pump charge

Question: How do you determine the sizing of a capillary tube for a system, and how do you clear a plug or restricted cap?

Transformers

Walk-in freezer retrofit

Helpful megohmmeter

Switching compressors

Ester Oils

Question: What is the best way to charge a residential a/c unit and why? How can you tell when a residential a/c unit is properly charged?

Undersized OEM Filter Driers

TXV sensing bulb location

Question: Can you explain the difference between the 90+ efficiency gas furnace and older units? Would you also give an explanation for having an induced fan blower?

Cap tube orientation

Swollen capacitor

Installing relief valves

Question: What is the minimum pressure drop across a TXV valve that still allows it to function properly?

Discharge Lines

Oil Change

Crankcase pressure regulator

Vacuum Pump Speeds

Discus Compressors

Ester Oils

Ins and outs of hvac motors

Sleeve Bearings

Don't judge motor status by surface temperature

Sightglass oil problem

Replace a reversing valve to avoid acid jamming it

Aluminum evaporator coils

Q What is the correct method of piping two 30-ton TEVs from a common liquid line?

Charging a cascade system

Q Charging thermal expansion valve systems with long line sets.

Explore all the possible causes of compressor terminal burnout

Q How often must the condenser coil be cleaned on a residential air-conditioning unit?

Dirty evaporator coil

Effect of receiver location

Bearing Grease

Hot gas defrost query

Moisture removal

Noncondensibles and refrigerants

How does refrigerant circulate in compressor oil cooler lines?

Low operating cost of DC motors competes with higher initial cost

Over-amping Replacement Motor

Prevent excess power demand by limiting the capacity setting

Psychometrics

Blown capacitor and fan motor running backwards?

Sleeve-bearing motor speed

Solenoid valve problems

Swollen capacitor

Three-in-one starter kits

Triple vs. single evacuation

Understanding impedance

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